Not from what I can tell. The only info on a Digimon Adventure reboot is from some Wikia websites with no sources or confirmations of any kind. One of them was for a 2015 reboot, which was probably made after the 15th Anniversary announcements of a new project, but before the actual announcement that the new project was Digimon Adventure Tri. The other that I saw listed the reboot as coming in 2019 as part of the 20th Anniversary which is nothing but wishful thinking on whoever made that entry.

Unless you are referring to Digimon Adventure Tri, which isn't a reboot but a sequel.